Harrow



May 6, 1930. J, JENSEN 1,757,855

HARROW Filkd April 2a, 1928 the cutting or piercing element of the unit,

to be directed with a driving rather than a Patented May 6, 1930 UNITED STATES PATENT OFFICE JENS JENSEN, OF SONDERHAV IROST HOLBQL, DENMARK, ASSIGNOR '10 BAYERISCHE EGG-ENFABRIK AKT.-GES., OI NUREMBER Q- GERMANY.

HABROW Application filed April 28, 1928, Serial No.

This invention relates to an improvement in harrow-like ground implements wherein the construction provides a plurality of loosely connected units capable of reversal with respect to'the surface being treated and presenting in one position a cutting element and in the other position a piercing element.

The primary object of the present invention is to so connect the respective units as to insure a relatively independent swinging or lateral movement during operation in order to provide for the automatic clearance of the units with respect to obstacles, and to cause pulling force onto such obstacle.

The invention is illustrated in the accompanying drawings, in which:

Figure 1 is a broken perspective view showing a plurality of units in interconnected relation.

Figure 2 is a plan of the same, the final units of the series being shown connected with a drag bar.

Figure 3 is a side elevation of the drag bar.

Fi ure 4 is a side elevation of the connector used etween the dragbar and certain of the units.

Figure 5 is a front elevation or edge view of one of the units.

Figure 6 is a front elevation of the piercing element.

Figure 7 is a side elevation of the same.

Figure 8 is a transverse section of the same.

The harrow is made up of a series of units a of metal and of substantially triangular shape. The base edge of the unit is out along lines parallel to its inclined edges, presenting arms 6 and the material thus divided is bent downwardly into the form of a cutting share a. Obviously, this share may be projected at any angle with respect to the p ane of the unit proper and may, if desired, be sharpened or otherwise formed to secure the desired cutting operation.

A piercing element 0 projects at right angles to the face of the unit at a point in rear of the cutting element a and in a direction opposite to such cutting element. The piercing element is preferably of dagger-like for- 273,595, and in Sweden February 13, 1928.

mation having side cutting edges curved with respect to the verticalplane and terminating in a sharp point.- These piercing elements, if desired and as indicated in Figures 6 and 7, may have threaded stems adapted to be secured removably in the unit.

The unit-s are connected in transverse rows and in an appropriate number of such rows to make up the harrow. The units are arranged in this connection with the cutting elements a towards the front of the harrow or unit and the apex of the unit proper towards the rear. The arms I) and the apex are formed with openings a reinforced by wear washers a to provide for connecting respective units together and such apex opening is provided with a ring a through which is passed a conductor d.

This connector is in the form of a. wire length bent intermediate its ends and terminally formed with eyes to cooperate with the openings (1 in each of two ad acent units towards the rear that is to say, the ring a of a particular unitii's' at the rear end of that unit in the direction of movement of the harrow and the connector d passing through such ring is terminally connected to the arms 6 of two immediately following units, as clearly shown in Figure 2. Thus, each unit of any one row is connected to two units of the immediately following row, so that normally the units are offset with respect to each other longitudinally of the harrow.

The connectors H between certain rows of the units have their respective legs of uniform length while the connectors d between other rows of the units have a short leg d and a long leg at. In applying this non-uniform type of connectors, the long leg' in a :particular row will be towards one side of the arrow while in the next row in whichthenonuniform connectors are used, the long leg will be towards the opposite side of the harrow. As a result of this arrangement of the connectors, it will be apparent that the units are given an uneven and irregular movement relative to each other in the event of any obstruction in the path of travel of the cutter or of the piercing element, with the result that the units will rise and be directed onto the obstruction as by a driving or piercing movement tending to a more effective action of the units;

If preferred and as shown, the final row of 5 units may be connected to a drag bar indicated at 6 having on one surface a series of teeth 6 to assist in smoothing up the surface, the opposite edge of the drag bar being smooth to. present what is known as a fiat 10 drag. The drag bar is preferably of angle iron (T-beam) formation and is, of course, to be used with either operative surface in accordance with the use of the harrow proper to present either the cutting members a or 5 the piercing member a for use. The terminal connections, or other points of connection if desired, of the drag bar may be in the form of a more or less rigid member 7 serving to prevent displacement of the drag bar during the operation of the harrow.

A characteristic feature of the construction is the tumbling action of the individual units, serving as it does to bridge and obliterate obstacles which may be out or pierced and to ride over such as cannot be out or pierced without seriously interferring with the proper operation of the rest of the harrow or tending to any permanent displacement of the units. This action is gained by the particular form of the connectors and their relative reverse arrangements between alternate rows of units.

What is claimed to be new is: i

1. A unit for harrows and the like comprising a flat plate of substantially triangular formdivided from its base portion in parallelism to its inclined edges, the intermediate portion between the divisions being turned at an angle to the plane of the plate to provide a cutting edge, and a pierclng point removably'secured to the plate in advance of and projecting from the plate in a direction 0pposite to the cutting edge.

2. A harrow comprising a plurality of V- shaped units arranged in transverse rows with the base portions of the units towards the front of the harrow, connectors loosely joining the apexes of the units of one row with the extremities of the base portion of the units of the next row, and a drag bar connected to the final row of units, said drag bar being substantially T-shape in cross section, one edge of the bar forming a smooth dragging surface and the opposite edge of the bar having teeth.

In testimony whereof I afiix my signature.

J ENS JENSEN. [L. 5.] 

